Daedalus used wax, feathers, and twine to build some wings for himself and his son Icarus. Daedalus would warn Icarus to fly at a middle height so water would dampen the wings and the sung won't melt the wings. Daedalus is a genius inventor who thought of escaping by air with making wings.
algebraic expressions use variables, in problems you can pick one thing and call it X and another thing and call it Y. whatever those two things you picked can equal some unknown thing.
